File extensions with I

I Intermediate file (Borland C++)
I00 WinShrink File (I-zero-zero. Usually followed with 1 or more .i0x files, and .md5 file)
IAN Text file (Sterling Software) (Groundworks COOL Business Team Model)
IAX Bitmap (IBM Image Acess eXecutive)
IBM Compressed archive (ARCHDOS, IBM Internal only)
ICA Bitmap graphic (Image Object Content Architecture)
ICA Citrix file
ICB Targa bitmap
ICC Catalog file (IronClad)
ICC Printer file (Kodak)
ICD Drawing file (IronClad)
ICL Icon Library (Generic industry standard)
ICM Image Color Matching profile
ICN Icon source code
ICO Icon (Microsoft Windows 3.x)
ICS Scene file (IronClad)
ID Disk identification file (Generic)
IDB Intermediate file (Microsoft Developer)
IDD MIDI Instrument Definition
IDE Project file (Borland C++ v4.5)
IDF MIDI Instrument Definition (Windows 95 required file)
IDIF Identification file (Netscape saved address book)
IDL OMG Interface Definition Language (IDL) file
IDQ Cognos Impromptu Query Definition
IDW Vector graphic (IntelliDraw)
IDX Microsoft Outlook Express file
IDX Index file (Microsoft Clip Gallery v. 1.x)
IDX Index file (Pro/Engineer)
IDX Relational database index (Microsoft FoxPro)
IFD Adobe Output Designer forms definition source file
IFD Form (JetForm Design)
IFF Image (Sun TAAC/SDSC Image Tool)
IFF Interchange file, (general purpose data storage format))
IFO Graphic object layer data (ImageForge Pro)
IFO Digital Video Disk (DVD) datafile
IFP Script file (KnowledgeMan)
IFS System file (OS/2)
IFS Create executable library (ImageForge/ImageForge Pro)
IFS Compressed fractal image (Yuvpak)
IGES Initial Graphics Exchange Specification (Generic)
IGF Metafile (Inset Systems)
IIF Interchange file (QuickBooks for Windows)
IIM Music module
ILB Datafile (Scream Tracker)
ILBM Bitmap (graphic image)
ILK Program outline (Microsoft ILink incremental linker)
IM8 Raster graphic (Sun Microsystems)
IMA Vector graphic (EGO,Chart)
IMA Image (WinImage)
IMF MIDI music file (Corridor 7, Blake Stone, Wolfenstein 3D, Spear of Destiny)
IMG Bitmap graphic (Ventura Publisher)
IMG Image (GEM)
IMP Spreadsheet (Lotus Improv)
IMQ Image presentation (ImageQ)
IMR Cognos Impromptu report
IMS Create executable library data (IconForge)
IN$ Installation file (HP NewWave)
IN3 Input device driver (Harvard Graphics v3.0)
INB Test script (Vermont High Test)
INC Include file (Assembler language or Active Server)
IND Shared Database file (Specifically in Microsoft Windows)
IND Index (dBase IV)
INDD Adobe InDesign document
INF Type I LaserJet font information file
INF Install script (Generic)
INF Information file (Generic)
INI Setup file (MWave DSP synth's mwsynth.ini GM)
INI Bank setup file (Gravis UltraSound)
INI Initialization file (Generic)
INK Pantone reference fills file (CorelDRAW)
INL Inline function file (Microsoft Visual C++)
INP Source code for form, (Oracle,version 3.0 and earlier)
INRS INRS-Telecommunications audio
INS Install script (InstallShield)
INS Sign-up file (X-Internet)
INS Instrument file (Ensoniq EPS Family)
INS Sample (Cell/II MAC/PC instruments)
INS Datafile (WordPerfect for Windows)
INS Installation script (1st Reader)
INS Instrument music file (Adlib)
INS Inspiration file
INT Interfaced units (Borland)
INT Intermediate executable code (Produced when a source program is syntax-checked)
INTF iNotes file
INTS iNotes Secret file
INX Index file (Foxbase)
IO Compressed archive (CPIO)
IOB 3D graphics database (TDDD format)
IOC Organizational chart (Instant ORGcharting!)
IOF Findit document (Microsoft Findit)
ION File description (4dos descript.ion)
IPL Pantone Spot reference pallette (CorelDRAW)
IPS International patching system binary patch file
IQY Internet inquiry (Microsoft)
IRS Resource file (WordPerfect for Windows)
ISD Spell checker dictionary (RapidFile)
ISH Compressed archive (ISH)
ISO ISO (International Standards Organization table, aka: ISO)
ISO Lists the files on a CD-ROM; based on the ISO 9660 CD-ROM file system standard
ISP Sign-up file(X-Internet)
IST Instrument file (Digitaltracker)
ISU Uninstall script (InstallShield)
IT Music module (MOD) (Impulse Tracker)
IT Settings file (intalk)
ITF Interface file (JPI Pascal TopSpeed)
ITI Instrument file (Impulse Tracker)
ITS Internet document set (possibly a Microsoft file)
ITS Sample file (Impulse Tracker)
IUD Oratcl applications IUD Maker file
IV Open Inventor file
IVD Microdata dimension or variable-level file (Beyond 20/20)
IVP User subset profile (Beyond 20/20)
IVT Table or aggregate data (Beyond 20/20)
IVX Microdata directory (Beyond 20/20)
IW Presentation flowchart (IconAuthor-HSC Interactive)
IW Screensaver (Idlewild)
IWA Text file (IBM Writing Assistant)
IWC Install Watch document
IWM Start file (IconAuthor)
IWP Text file (Wang)
IZT Binary token file (IZT)

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